Move the ignition coil to another cylinder and see if the miss fire moves. If so replace that ignition coil. If the miss fire stays on that cylinder it is more likely the fuel injector. Was their carbon on the spark plugs when you removed them? This is indicative that the fuel injector is gummed up.

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If this is still under the Warranty, back to the Dealer it goes. If you had to pay for an unneeded part, ask for compensation.The sparkplug and coil get a signal to fire from the PCM. If the signal is not getting to the #8 coil/plug, then you need to move upstream to the PCM. Something may be corroded in the connector for that single cylinder.The other test is the Noid test for injector firing. You might want to throw a new injector into the #8 spot and see if it helps. Finally, the rear cylinders,4 and 8, have been used to route exhaust gas to the EGR. This is an additional duty that may effect exhaust flow on that single cylinder.You did not state the year of your vehicle. For a time, a part called a "Cam Phaser" on 4.6L and 5.4L V-8 engines would cause timing issues inside the motor. Each side of the motor is independently timed, so you can have an issue on only one side of the motor. Perhaps with cylinder 8, a combination of events is causing your problem and when both the EGR flow demands from cylinder 8 and improper timing from a bad "Cam Phaser" causes a misfire. The "Lean Code" which has not appeared is an average of all 4 cylinders on one bank. Since you are not dumping "Raw, unburned fuel" from cylinder 8, we can assume that cylinder 8 is running lean and may not even be getting fuel.

REPLACE DISTRIBUTOR CAP AND ROTOR REPLACE SPARK PLUGS AND WIRES IF NOT BEEN CHANGED IN LONG PERIOD OF TIME.CHECK IGNITION TIMING.CHANGE AIR FILTER CLEAN FUEL INJECTORS.IF ENGINE STILL MISFIRE IGNITION COIL IS WEAK OR YOU HAVE LOW CYLINDER COMPRESSION.

You need to remove the top cover 1st. Then remove the gray trim covers on the left and right banks by pulling straight up.You will find individual coils in each cylinder. Disconnect the connector of the coil and pull the coil straight up.The plugs are under each coil.

I would repalce the fuel filter, air filter and the sparkplugs. Check the boots at the plugs for holes burned through by the spark plug high voltage. It would be helpful to know the mileage of this vehicle.

How is the pressure in the fuel rail? a low pressure will cause erratic firing of the injectors - the further down the rail u get usually the worse the problem. If the fuel filter was not changed regularly or if the vehicle stood for a while, dirty fuel/standing fuel at some time in the recent past, this **** will accumulate in tyhe injectors. To avoid spending a loada cash, swap a few injectors around and see if the problem moves with the injector.